Furnace.



740,553.- f Y PATENTE) ocr, 6,'1903.

, J. Hwcoamcx.

mames,

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f/J 'l Y Y 'Y A l v Mamas-n no. irtoees., l v t l UNITE-D, STATES htented October E, l

PATENT OFFICE. f

J'OllN MACCORHACK. OFv BAYONNE, NEW' JERSEY, vASSIGNOR TO ROYAL C.

' PEABQDY, 0F BROOKLYN, NElV YORK.

FURNACE.

.arzcmcarox farming par: of mmm einem No. ramene, einen october e. 190s.

' 'mueca eea :muy as. isos. strains 91.559. ci mam -Ta all whom it' may concern;

Be it known that.- I, JOHN ZdACCoRMaCK, a citizen of tlieUnited, States, residing at Bayonne, in the county of Hudson audStnte of` New Jersey, have invented a. certain new and useful Improvement in Furnaces., of which the following is a description.

My invention relatos to various new and useful improvements in furnaces of the typo employing automatic stoiiiugdevices; and my object is to provide a new and useful arrnngement of the gratesurface for facilitating und improving the combustion' andA also to provide new and improved mechanism for e'fecting the feed of the fuel from tbe magazine anddistribn ting it with the proper uniformity sircd result comprise a plurality of hollow rotary grate-bars, which in addition to performinga feeding function also facilitate the combustion of the fuel by supporting it while itis subjected to currents of air either by vnatural or forced draft.

I In the preferred embodimentof the invention, therefore, it consists of a' gratesnr- Lface formed of alternately-arranged station- ,ary and rotary grate-bars, the latter-:being by j f preference arranged on .a 'plaueeomewhat above the stationary grammar-8,30 that the latter will extend practically in line with the diameters of the rotary gratebars, thus efectf ively closing the spaces between the rotary and stationary grate-bars, preventing the for mation of pockets between the two in which the fuel might be crushed and allowing the fuel in transit to accumulate in small quan? tities ou the stationary grate-bars until complete combustion thereof issecured. Y The invention alsopreferably contemplates the employment of a clinkepapron coperatng with the grate-surface Vand toward which the fuel will be fed, said apron being in the gratetsurface and permits the latter to be 5 du m-ped, when desired, into the ash-pil:` The grutosurface as aw-hole is also preferably inclined from the feeddnagazine toward .the

.side wall or walls of the furnace, which facilitates the travel of the fuel over the same. ti

In order that the novel fea-turesof my invention may be understood, attention is direc-ted to the accompanying drawings, forming a part of this specification, in which- Figure l is s longitudinal .sectional view 6 illustrating my improved furnace in its preferred form and showing n well-known type of automatic Stoker for supplying the fuel to and feeding it out'zof the Webmagazine. Fig. 2 is a cross-sectional view showing the 7 grate-bars insectiou on one side olf the fuel.v magasine and illustrating one of the bear ingplates for the shafts of the rotary gratebars ou the other sido; Fig. 3, a section in line 3- 3 .of Fig. 2, showing the shaft of one of 7 the rotary grate-bars and illustrating in part. the mechanism for rotating thesame; Fig. 4, an exterior vice' of the furnace, showing the mechanism for operating the gratc.burs; and

Fig. 5, a longitudinal section on au enlarged E scale, illustrating the Vpreferred form of rotary grate-bars; i

In all of the above vie-vrs Accnrespomiing part's'are represented .by the same numerals of reference. y u f i The furnace" is provided with the-usual side 'walls-1 1 aix-ont wall 2, and a` bridge-wall 3. A fuel-magazine- 4 is mounted on the ash-pit.

floor and receives f uel'ifro'm any suitable and approved automaticstoker. In the dratirg in-gs .I show a feediscrew, 3 of varying pitch, carried on a shaft and driven by wornbgoar-` s ing from a driving-shafts 7. vThe stoker,

which is of a well-k`nown form, -is not claimed herein, and it may be replaced by any other"l desired automatic staking mechanism. A hopper 8 feeds .the fuel to` the screw 5, as will be obvious. The A-ir'ont and rear ends of the magazine are protected by twyers 9 9, secured to or embedded in the front and bridge r walls, respectively, and, if desired, 't'.nrye'rs 10 maybe placed in the side walls 1, receivany unconsnmed fuel to n choker-apron A1.5,V

ing air from the space below the grate-sur` face, ns shown, or iii any others-sy. Monutedwithinthe furnace, and preferably on each side of the magazine 4,-are stationary grates l1, which are of any suitable and approved form. These gratos are supported byplstes l2, carried by the front and bridge walls of the furnuce. lu the embodiment of the lnvention shown eLehstntionarygrat-e istnade in the form of un inverted chuunel, theflat. member o! which is suitnblyslotted or perforated to permit air to pass up through the sume. This umkesa'convenientarrangement, ns it gives great longitudinal strength to rel sist strains which may be imposed on the bnr by cxtreme changes, iu temperature. The gratebnrs 11 mayboof cnstfiron' orofnny suitable material.

Withthe preferred embodiment. of the invention shown iu the drawings I arrange onl either side of each stationary gratera rotating grate-har 13, eechbar being mounted o n a shaft 14, carried in bearings in the supporting-plates 12. 4lt will be observed that one of these hollow rotary grates is arranged closelyndjuccnt to the top of theA magazine, so that that particular grate-bnr at each side acts as a sidel twyer for protecting the ina-gazine from the effect of the heat. One of the hollow rotary grstes will also he mounted on the outside of each outermost stationary gratelmr, so as to conductthe clinkers and as shown. Each c linkcr'apron ls preferably made in the form ol' a grote-surface carried on a central supportiugshnft 16, mounted in the supportiimplzites 12. This shuftfis extended through the front wall of the ffurnace, and ut its outer cud it is provided with a rectangulur head 17 for receiving a wrench in order to perm it. the el inker-aprou to be turned for the purpose of dumping any clinkers in the ash-pit. The stationary grate-bars 11 are preferablyarrangedsubstantially in line with the horizontal diameters of the rotarygrates,

so as to thereby occupy a plane below the etary grate-bars the fuel in the course of trunr.sit across the gratesurface'will be allowed to accumulate slightly ou the stationary gratebsrs,soas to'be entirely consumed, permitting ash to fall through the grate-.openings of the stationary bars. Air tov support combustion is fed lthrough the rotary and sta.-

tonary grammars, as well 'as through the choker-aprons, from th'e 'ash-pit below the the same, of a pair of inclined grate-surfaces Yvided at their ends with sprocket-wheels 2.0,

,the end ofone of the shafts 14 for each se't below it `.vill be piled up over the'sides of A purpose and can be operated with good efgatto-surfaces" for-receiving the clinkers from grate-surface. Theditt may bejeither natnml or forced, and in the latter case'blastpipe 1S may be arranged in the ash-pit ouv either side of the magazine for'the purpose.

As shown i'n Fir. 6, each rotary gratebar is made, preferably, of hollow castsectouslg., keyed to the shaft 14, secas to urn therewith. These sections may be of lcest. metal orofsoiue refractory material, like' tire-brick. The several shafts Hof the rotary grate-bars extend through the troutI wall i' and nre-proover which runs a sprockebchan 2l. The z'uaiu d rtviugjshaft 7 is providedl with worms 22 thereon, each driving a worm-gearll on of grato-bars. It. 'will be seen 'that the vrotti tion of the shaft 7, therefore, drives the sprocket-chains 21 and 'con tinuously'operates both sets of rotary grate-bars.

In operation the fuel will besupplied to the hopper Send by the feed-screw 5 will 'beA fed into the magazine 4, so as to till the latter. As fresh fuel enters the'magszine fromthe "magazine and will flow uniformly over both grate-surfaces. The rotsting gratos 13 will carry the fuel successively from one stationary grate-'bar to the other, and duringits passage toward the clinkerfsprons 15cm each side the fuel will be eifectivelyconsnmed. Clinkers will becn-rried by the travel of the fuel toward the -clinker-apr'ons and will accumulate thereon, froml which they can be dumped from time to time. Any unconsumed fuel which may be-ted onto thecliuker-aprons will also be consumed thereon.

The entire arrangement is e'ective for the cie-ncy. The parte are interchangeable and are sinn ple in construction. The dri-ving mechanism used is effective and durable.

. Haring non' described my invention, what I claim as new, and desire to secure ily-Letters Patent, is as follows: c

In a furnace, the'coinbination with a fuel magazine and means for 'supplying fuel tocomposed of alternately-arranged stationary "and rotary girate-bars,'said stationary bars arranged o-n the plane of the diameters of the rotary bars, forming relatively deepv pockets between said rotary bars,.and a. centrally-pitro'ted clinlter-spron at the end of'each of the the same, substantially as set'forth.

Thisspeciticato-n signed andwitnessed this' lthday of'Jann-ary, 19,0?, Y

-, JOHN MsccoRMAoK.'

Witnesses:

JNO. Ros'r. TAYLOR, .Tomi Louis Lofrsen. 

